Drawing instrument for section-lining and for laying down and measuring angles.



e. LIINNQVIST. DRAWING INSTRUMENT FOR SECTION LINING AND FOR LAYING DOWNAND MEASURING ANGLES. APPLICATION FILED JAN. I3. I916.

1,277,962. Patented Sept. 3,1918.

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UNITED STATES PATENT OFFICE.

GUSTAF LillNNQVIST, GOTTENBORG, SWEDEN.

DRAWING INSTRUMENT FOR SEOTION-LINING AND FOR LAYING DOWN AND MEASURINGANGLES.

Specification of Letters Patent,

Patented Sept. 3, 1918.

Application filed January 13, 1916. Serial No. 71,958.'

To all whom it may concern:

Be it known that I, GUSTAF LoNN vIs'r,

asubject of the King of Sweden, residing in Gottenborg, in the Kingdomof Sweden,

have invented a new and useful Improvement in Drawing Instruments forSection- Inning and for Laying Down and Measurlng Angles, of which thefollowing is a specifica tion.

This invention relates to an improvement in drawing instruments forsection lining and for laying down and measuring angles by means ofwhich a ruler may be moved and securely guided parallel with itself.Drawing boards have been designed in which the ruler or straight edge isgiven such a motion 'by means of special balancing devices. The presentinvention possesses the advantage over such arrangements, how ever, thataccording to the same the instrument maybe removed from a board toanother, and the invention also provides means for securing the ruler inany desired position and for moving it step by step, which isparticularly useful in drawing section lines, or similar workwhere agreat number of equally spaced lines must be drawn.

My invention refers'more particularly to the class of drawinginstruments in which the'ruler is moved along and is guided by a rail, agroove, or the like, secured to one edge of the drawing board, and isprovided with a locking device for securing the same in differentpositions along the rail. My invention is broadly characterized by thisthat the instrument is also provided with such a device, preferablyadjustable, that by 1 means of the same the ruler may be given astep-bystep motion along the rail.

The ruler or straight edge is suitably provided with a longitudinal railand with a 'movable arm guided on this rail, which arm serves astriangle and is provided with looking and moving devices of the samekind as provided for the ruler. This arm is preferably made of two partswhich may be turned relatively to each other and be secured in differentangles of adjustment.

In the accompanying drawing I have- 3 shown an embodiment of myinvention by way of example, Figure 1 showing a side view and Fig. 2 aplan view of the same. Fig. 3 shows to a larger scale a section on theline AB in Fig. 2, and Fig. 4; shows, also to a larger scale, a sideview of the locking devices for the arm on the ruler.

The drawing edge with a rail 2 preferably made of metal and secured tothe drawing board by means of screws or the like. The ruler or straightedge 3 is guided on this rail 2 which projects into slots 4: in theplate 5 preferably det acha bly secured to the ruler 3. In order tofacilitate'the moving of the ruler along Elie rail the plate 5 bearsagainst the rail-2 )7 rollers 6 and 9 taking upthe pressure on the upperedge of the ruler or its weight when the drawing board is inclined, arerigidly journaled in the plate 5, while the opposite rollers 7 and 8 arepreferably resiliently journaled, for instance in a flexible bracket 38as shown in Fig. 3, in order that the ruler shall not be able to stickon the rail 2.

A lever 11 is pivoted at 10 in the plate 5 and is provided with a slotentered by the rail 2. This slot is of such width that when means ofrollers, balls or the like; The

board 1 is providedat one rail 2, the rail is free in the slot so thatthe ruler may be moved, but when, the lever 11 is held in the positionshown in Fig. 2, actuated by a'spring 12, it will catcharound the rail 2thus preventing the ruler 3' from being moved; 7 I

A screw-13 is'also journaled in the plate 5 which screw is provided witha head 14 for turning the same. By turning the screw 13 a stop 15 on thesame is moved. A lever 16 is pressed against the stop 15 by the spring12 on the screw 13. A fixed stop 17 for the lever 16 is provided in theplate 5.

By turning the screw 13 the lever 16 is.

ment with the rail 2. By pressing the levers '11 and 16 toward eachother simultaneously,

the lever 16 will engage the rail 2 while the lever 11 when pressedagainst the fixed arm 13, is released from the rail 2. Owing to thepressure on the lever 11 the ruler 3 is then pressed. down.vard untilthe stop 17 hills "hiainst the lever 113. When the lever 11. is nowreleased while pressure is still exerted on the lever 16, the lever 11will lock the ruler to the rail in its new position, and when then thelever 16 is released it will be moved back by the spring 12 against theadjustable stop 15 and out of engagementwith. the rail 2. by renewedpressure on the levers it and 16 the rulers will be moved another stepdownward. The length of the step is varied by adjustment of the stop 15,whereby the initial position of the lever 16 becomes more or lessdistant from the stop 17.

The ruler is provided with a longitudinal rail 19 on which an arm isguided, which serves as a triangle This arm consists of a lower part ora plate 20 sliding on the rail 19 by means of rollers or balls 21, 22,and 2a. A lever 26 is pivoted at in the plate 20. This lever 26corresponds, as regards purpose 11 of the ruler. This lever 26 isactuated by a spring 27 on a rotatable screw 28 carrying an adjustablestop 29 for the lever 30 which corresponds to the lever 16. A fixed stop31 for the lever 30 is also provided in the plate 20. llhe arm may thusbe secured to or moved step by step along the ruler in the same manneras above described for the ruler.

In order that the said arm may be used in different angles of adjustmentrelatively to the ruler, the following arrangement is provided: A disk32 is pivoted to the plate 20 at 33 and may be secured to the plate atdifferent angles of adjustment by turning the handle 3% which isrotatably secured to the plate 20 and provided with an oblique surfaceso that when turned it will press the lock-plate 39 against the disk 32,as will be understood by reference to Fig. l. The arm proper, 35, isalso pivoted at 33 and is provided with a graduated disk 36, which maybe adjusted relatively to the disk 32 and secured to the same indiiferent positions by means of a strap 37 eccentrically journaled inthe disk 32 as shown in Fig. 4t, or by means of some other suitabledevice. In order to set the arm along a line on the paper the handle 34:is turned, while the strap 37 remains closed, and the arm 35 is swung tothe desired position, whereupon the handle 3i is again turned intoclosing position. If it is desired to draw a line at a certain angle tothe first one, the strap 37 is opened and the arm 35 is adjustedrelatively to the disk by means of the graduated disk 36.

The last described arrangement is useful not only for drawing a. line atan angle to and operation, to the lever a certain line of the drawing onthe board to which the ruler is secured, but also for transferring a,drawing from a drawing board to another, as is the case for instancewhen enlarging or reducing a drawing. The arm 35 is then adjusted on themain drawing in the described manner, and the ruler together with thearm is then easily removed to anothaboard on which the desired line isthen drawn along the arm 35.

My invention is not limited to the embodiment above described, which hasbeen referred to by way of example only.

l Vhat I claim is 1. In a drawing instrument for section lining and forlaying down and measuring angles, the combination of a drawing board, arail secured to one edge of the board, a. ruler, means for guiding theruler along the rail, a lever pivoted to the ruler, a spring normallypressing said lever into engage ment with the rail, a second levernormally held by the said Spring out of engagement with the rail butarranged to engage the rail when turned, a fixed stop for the secondlever, and an adjustable stop for said second lever, substantially asand for the pnrpose set forth.

2. In a drawing instrument for section lining and for laying down andmeasuring angles, the combination of a drawing board, a rail secured toone edge of the board, a ruler, means for guiding the ruler along therail, said means consisting of two pairs of rollers, one roller of eachpair being rigidly mounted and the other resiliently mounted, a lockingdevice for securing the ruler to the rail in different positions, andmeans for imparting to the ruler a step-bystep motion along the rail,substantially as and for the purpose set forth.

3. In a drawing instrument for section lining and for laying down andmeasuring angles, the combination of a drawing board, a rail secured toone edge of the board, a ruler, means for guiding the ruler along therail, a locking device for securing the same to the rail in difierentpositions, a rail mounted on the ruler, an arm, means for guiding thearm along said rail on the ruler, a locking device for securing the armto said rail in difierent positions, and means for imparting to the arma step-by-step motion along said rail, substantially as and for thepurpose set forth.

l. In a drawing instrument for section lining and for laying down andmeasuring angles, the combination of a drawing board, a rail secured toone edge of the board, a ruler, means for guiding the ruler along therail, a locking device for securing the same to the rail in differentpositions, a rail mounted on the ruler, a. plate, means for guiding saidplate along said rail on the ruler, a locking device for securing theplate disk, means for locking said second disk to to said rail indifferent positions, means for vthe first-mentioned disk in differentangles imparting to the said plate a step by-step of adjustment, and anarm secured to said 10 motion along said rail, a disk pivoted to seconddisk, substantially as and for the said plate, means for locking saiddisk to purpose set forth.

said plate in different angles of adjustment, 7 r

a second disk pivoted to said first-named GUSTAF LONNQVIST.

Copies of thts patent may be obtained for five cents each, tiyaddressing the Commissioner 0:! Patents. Washington, D. 0.

